Main Difference
The main difference between Triceps and Biceps is that the Triceps is a arm muscle and Biceps is a muscle of the arm.
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Triceps
The triceps, also triceps brachii (Latin for “three-headed muscle of the arm”), is a large muscle on the back of the upper limb of many vertebrates. It is the muscle principally responsible for extension of the elbow joint (straightening of the arm).
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Biceps
The biceps, also biceps brachii (Latin for “two-headed muscle of the arm”), is a large muscle that lies on the front of the upper arm between the shoulder and the elbow. Both heads of the muscle arise on the scapula and join to form a single muscle belly which is attached to the upper forearm. While the biceps crosses both the shoulder and elbow joints, its main function is at the elbow where it flexes the forearm and supinates the forearm. Both these movements are used when opening a bottle with a corkscrew: first biceps unscrews the cork (supination), then it pulls the cork out (flexion).
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Triceps (noun)
Any muscle having three heads.
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Triceps (noun)
Specifically, the triceps brachii.
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Biceps (noun)
Any muscle having two heads.
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Biceps (noun)
Specifically, the biceps brachii, the flexor of the elbow.
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Biceps (noun)
The upper arm, especially the collective muscles of the upper arm.
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Biceps (noun)
A point in a metrical pattern that can be filled either with one long syllable (a longum) or two short syllables (two brevia)
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Triceps (noun)
any of several muscles having three points of attachment at one end, particularly (also triceps brachiiˈbreɪkɪʌɪ) the large muscle at the back of the upper arm
“the full range of triceps movement”
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Biceps (noun)
any of several muscles having two points of attachment at one end.
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Biceps (noun)
a large muscle in the upper arm which turns the hand to face palm uppermost and flexes the arm and forearm
“he clenched his fist and exhibited his bulging biceps”
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Biceps (noun)
a muscle in the back of the thigh which helps to flex the leg.